土壤微生物与有机物料对盐碱土团聚体形成的影响

发布时间：2018-12-30 19:18

【摘要】：为了研究不同来源的微生物群落和不同类型的有机物料对盐碱土团聚体形成的影响,采用土培实验,接种不同来源的微生物群落(青海盐碱土或黄棕壤制备土壤悬液)到盐碱土中,并添加腐熟的有机肥或半腐熟的有机物料(玉米秸秆和牛粪)。土样在常温下培养45、90 d后,测定土壤相关指标。结果表明,各处理之间,在pH值下降、土壤团聚体形成及微生物数量等方面,接种土著微生物及添加半腐熟有机物料处理(SS+MS-CD)的效果最好。该处理土壤pH值下降幅度最明显,与对照相比降低了0.6个单位,且土壤团聚体形成效果优于其他处理,形成了0.62%的大团聚体(2 mm),而其他处理均未形成2 mm的大团聚体,并增加了小团聚体(2~0.25 mm)的形成比例。该处理亦显著提高了土壤酶活性及土壤呼吸强度。实验结果为制备盐碱土改良措施提供了理论参考。
[Abstract]:In order to study the effects of microbial communities from different sources and organic materials on the formation of aggregates in saline-alkali soils, soil culture experiments were carried out. The microbial communities from different sources were inoculated into saline-alkali soils of Qinghai Province or yellow brown soil to prepare soil suspensions, and rotting organic manure or semi-rotting organic matter (corn straw and cow dung) were added to saline-alkali soil. Soil samples were cultured at room temperature for 45 minutes for 90 days, and soil related indexes were measured. The results showed that the effect of inoculating native microorganisms and adding semi-rotten organic materials (SS MS-CD) was the best in the aspects of the decrease of pH value, the formation of soil aggregates and the number of microorganisms among the treatments. Compared with the control, the soil pH value of the treatment decreased by 0.6 units, and the effect of soil aggregate formation was better than that of other treatments, forming 0.62% of the large aggregate (2 mm),). However, the other treatments did not form 2 mm large aggregates, and increased the formation ratio of small aggregates (2 0. 25 mm). This treatment also increased soil enzyme activity and soil respiration rate. The experimental results provide a theoretical reference for the preparation of saline-alkali soil.
【作者单位】：南京农业大学资源与环境科学学院/江苏省固体有机废弃物资源化高技术研究重点实验室;
【基金】：国家重点基础研究发展计划(973计划)项目(2015CB150504) 国家自然科学基金项目(41671256)~~
【分类号】：S156.4

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